Class InformationNumber: 4/687Name:Baths, closets, sinks, and spittoons > Drain, overflow or trap for a sink or bath > Drain and overflow > With valve > Bi-transit for drain of sink or bathDescription: Subject matter wherein the apparatus is a hollow member with one open end that fits into and is operated to open and close the drain of the sink or bath while the other end has an opening that is substantially upward from the drain and yet below the rim of the sink or bath to prevent overflow by providing a path through the member to the drain of the sink or bath to control the flow of fluid.